Steam from a geothermal spring coats bison in frost in this program, which presents a breathtaking look at wintertime deep within America's first national park, including bountiful wildlife and pristine landscapes.

An over-sized, Northwest Coast Indian-style dance mask, carted to "ROADSHOW" by its hopeful owner. Appraiser John Buxton admires the decorative piece, but regretfully points out the mask would be too big and heavy to use in a dance — and actually is a reproduction with a value of $1,500 to $2,000.